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Time-resolved thermally induced aberrations in a flash-lamp pumped Nd:Glass disk amplifier using a 2 × 2 position

M Ahmad¹, M Galletti², P Oliveira²

¹School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom.

The Review of Scientific Instruments

|January 3, 2020

Summary

A new method precisely measures thermal aberrations in large laser amplifiers. This technique reconstructs wave-front profiles, crucial for optimizing laser performance and understanding thermal effects in optical systems.

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Area of Science:

Optics and Photonics
Laser Science
Materials Science

Background:

Large-aperture laser systems are susceptible to thermal aberrations.
Accurate measurement of these aberrations is critical for beam quality.
Flash-lamp pumped Nd3+ glass disk amplifiers present unique diagnostic challenges.

Purpose of the Study:

To present a novel technique for measuring prompt, thermally induced wave-front aberrations.
To characterize these aberrations in a large-aperture flash-lamp pumped Nd3+ glass disk amplifier.
To demonstrate the capability of reconstructing wave-front profiles.

Main Methods:

Implementation of a diagnostic system using a 2x2 lens array.
Utilization of a 2x2 position-sensitive detector array.
Reconstruction of wave-front profiles based on measured data.

Main Results:

Successfully measured prompt, thermally induced wave-front aberrations.
Reconstructed the wave-front profile for the first five Zernike terms.
Achieved measurements within a temporal window of 8.5 ms.

Conclusions:

The novel technique provides accurate characterization of thermal aberrations.
This method is effective for large-aperture laser amplifiers.
The results contribute to improved understanding and control of laser beam quality.